CN109676989B - Fastening device for crankshaft connecting rod of mechanical press - Google Patents
Fastening device for crankshaft connecting rod of mechanical press Download PDFInfo
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- CN109676989B CN109676989B CN201910090186.7A CN201910090186A CN109676989B CN 109676989 B CN109676989 B CN 109676989B CN 201910090186 A CN201910090186 A CN 201910090186A CN 109676989 B CN109676989 B CN 109676989B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B1/00—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen
- B30B1/26—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen by cams, eccentrics, or cranks
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
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Abstract
A fastening device for a crankshaft connecting rod of a mechanical press is used for connecting a connecting rod cover and a connecting rod body, wherein a unthreaded hole is formed in the connecting rod cover, an internal thread hole is formed in the connecting rod body, the fastening device comprises a plurality of threaded connecting rods which are connected between the connecting rod body and the connecting rod cover and are arranged at intervals, and nuts respectively penetrate through the rod bodies of the threaded connecting rods, a heating channel is arranged in each threaded connecting rod, a locking channel and a cylindrical pin in the heating channel are arranged in each connecting rod body and are perpendicular to the internal thread hole, and a stretching device is arranged at the position, corresponding to one end of each threaded connecting; the threaded connecting rod is heated by a heating channel, the principle of expansion with heat and contraction with cold of metal and the combined action of a mechanical stretching prestress deformation technology are utilized, the threaded connecting rod is matched with the locking key plate and the cylindrical pin, the connecting rod cover and the nut are fastened by the locking key plate, looseness between the connecting rod cover and the nut is prevented, the pre-tightening force between the connecting rod cover and the connecting rod body is increased, and the fastening effect is enhanced.
Description
Technical Field
The invention relates to the technical field of mechanical presses, in particular to a fastening device for a crankshaft connecting rod of a mechanical press.
Background
The crankshaft connecting rod is one of the main parts of a mechanical press, and the main fastening mode at present is to perform looseness prevention by performing elastic deformation on an elastic washer on a locking bolt and simultaneously perform looseness prevention by coating an anti-loosening adhesive on the lower end of a stud. However, in the case of a hot forging mechanical press, the working environment temperature is high, which may cause the anti-loosening adhesive to fail, and obviously, the method of applying the anti-loosening adhesive to the lower end of the stud bolt is not feasible. The existing anti-loosening mode of the elastic washer between the stud and the bolt is a mode generally adopted at present, and the mode is convenient for loosening prevention and disassembly of a common nut, but the problem that the nut and the stud pre-tightening force are not enough exists for a mechanical press connecting rod cover with higher requirement. Under the conditions of impact, vibration and heavy load, the double-end stud and the nut are loosened frequently to gradually reduce or even eliminate pretightening force due to long-time use and continuous impact vibration, and a gap between the connecting rod cover and the connecting rod or between the connecting rod cover and the connecting rod body is increased lightly. The high-altitude flying safety accident can be caused by the fact that the threaded connection of the stud and the nut is in failure and is loosened or broken. In addition, in order to further prevent looseness, the root of the stud is further prevented from looseness by adopting a mode of tightening a set screw externally on the basis, and the mode not only causes thread damage of the root of the stud, has a common locking effect and poor reliability, cannot meet the long-time use requirement of a forging press, but also has the defect of incapability of recycling.
Therefore, the technical problem of fastening the crankshaft connecting rod has become one of the important factors that restrict the stability, reliability and service life of the forging press machine.
The above description is included in the technical recognition scope of the inventors, and does not necessarily constitute the prior art.
Disclosure of Invention
The invention provides a crankshaft connecting rod fastening device of a mechanical press, which is internally provided with a heating channel for heating a threaded connecting rod, utilizes the combined action of the principle of expansion with heat and contraction with cold of metal and the mechanical stretching prestress deformation technology and is matched with a locking device, increases the pretightening force among the threaded connecting rod, a connecting rod cover and a connecting rod body, enhances the fastening effect and solves the problems in the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the utility model provides a machinery press bent axle connecting rod fastener for connect connecting rod lid and the connecting rod body, the unthreaded hole has in the connecting rod lid, the internal thread hole that has of connecting rod, including the threaded connection pole that connects a plurality of interval setting between the connecting rod body and connecting rod lid, and wear to establish the nut at threaded connection pole body respectively, the inside heating passageway that is equipped with of threaded connection pole, the internal perpendicular internal thread hole of connecting rod is equipped with the locking passageway, be equipped with in the locking passageway with threaded connection pole complex locking device, correspond the position that the threaded connection pole was equipped with heating passageway one end is equipped with stretching device.
The locking channel is an installation hole perpendicular to the internal thread hole of the connecting rod body, the installation hole is communicated with the internal thread hole, and a locking device is arranged in the installation hole.
The locking device is a cylindrical pin, and the cylindrical pin is matched with a cylindrical hole arranged on the threaded connecting rod.
The locking channel comprises a stepped hole, and the stepped hole is communicated with an internal threaded hole in the connecting rod body through a fan-shaped groove.
Locking device includes locking bolt and with the fan-shaped locking briquetting of locking bolt butt, locking bolt sets up in the shoulder hole, fan-shaped locking briquetting setting with the same fan-shaped groove of fan-shaped locking briquetting shape, fan-shaped briquetting one end and locking bolt butt, the other end and threaded connection spare screw-thread fit.
One end face of the fan-shaped locking pressing block is an arc-shaped face, the other end face of the fan-shaped locking pressing block is a plane, the plane end of the fan-shaped locking pressing block is abutted to the locking bolt, the arc-shaped face end of the fan-shaped locking pressing block is in threaded connection with the threaded connecting rod, and the linear width of the arc-shaped face is smaller than the diameter of the threaded connecting rod and larger than the.
And the bolt head end of the locking bolt is provided with a through hole.
The threaded connecting rod is a stud.
The locking key plate comprises a circular ring plate, a plurality of evenly-divided locking flanges are arranged on the periphery of the circular ring plate, a plurality of convex keys are connected to the inner circular surface of the circular ring plate and are arranged along the axial direction of the circular ring plate, and the convex keys are correspondingly matched with a plurality of key grooves formed in the end portion of the connecting rod cover respectively.
The stretching device comprises a movable support and a stretching bolt arranged on the support, and the stretching bolt penetrates through a through hole arranged on the support and is connected with the threaded connecting rod.
The invention has the beneficial effects that: the fastening device for the crankshaft connecting rod of the mechanical press utilizes the combined action of the principle of expansion with heat and contraction with cold of metal and the mechanical stretching prestress deformation technology and is matched with the locking device, the elastic stretching of the threaded connecting rod and the main bearing pretightening force of the connecting rod cover are increased, and the high-strength fastening effect of the connecting rod cover and the connecting rod body of the mechanical press is achieved. The locking key plate structure fundamentally achieves the anti-loosening effect between the stud and the nut under the conditions of high strength, impact vibration and heavy load of the connecting rod cover of the mechanical press. The root sector-shaped locking pressing block is additionally arranged after the stud is deformed in a prestressed mode, so that the problem that looseness of a looseness preventing agent at the upper end of the stud is caused due to failure in a high-temperature environment can be solved to the maximum extent, and threads of the stud cannot be damaged. The invention has the characteristics of unique structure, stable performance, safety and reliability, achieves the fastening effect between the connecting rod cover and the connecting rod body of the mechanical press under the conditions of impact, vibration and heavy load, improves the working stability, safety and reliability of the mechanical press, ensures the operation precision and safety of the mechanical press and an automatic production line of the mechanical press, and improves the product quality.
Drawings
FIG. 1 is a state diagram of the present invention in use;
FIG. 2 is an enlarged view of FIG. 1 at I in example 1;
FIG. 3 is an enlarged view taken at II in FIG. 1;
FIG. 4 is an enlarged view of the locking keypad of FIG. 3;
FIG. 5 is a bottom view of FIG. 4;
FIG. 6 is an enlarged view of the bracket of FIG. 3;
FIG. 7 is a left side view of FIG. 6;
FIG. 8 is a schematic structural view of example 2;
fig. 9 is a cross-sectional view a-a of fig. 8.
In the figure, 1, a connecting rod body, 2, a connecting rod cover, 3, a stud, 4, a heating channel, 5, a set screw, 6, a cylindrical pin, 7, a locking key plate, 8, a nut, 9, an opening, 10, a bracket, 11, a stretching bolt, 12, a threaded hole, 13, a convex key, 14, a locking folding edge, 15, a locking bolt, 16 and a fan-shaped locking pressing block.
Detailed Description
In order to clearly explain the technical features of the present invention, the following detailed description of the present invention is provided with reference to the accompanying drawings.
In addition, in the description of the present invention, the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Example 1
As shown in fig. 1-7, a mechanical press crankshaft connecting rod fastening device is used for connecting a connecting rod cap 2 and a connecting rod body 1, wherein a unthreaded hole is formed in the connecting rod cap 2, an internal thread hole is formed in the connecting rod body 1, a plurality of threaded connecting rods are arranged between the connecting rod cap 2 and the connecting rod body 1 by penetrating through the internal thread hole, nuts 8 are respectively arranged on the rod bodies of the threaded connecting rods in a penetrating manner, a heating channel 4 is arranged inside the threaded connecting rods, a threaded hole 12 is formed in one end of the heating channel 4 of the threaded connecting piece communicated with the outside, the threaded hole 12 is communicated with the heating channel 4, a locking channel is arranged in the connecting rod body 1 by penetrating through the internal thread hole vertically, a locking device matched with the threaded connecting rods is arranged in the locking channel, and a stretching device is arranged. Above-mentioned threaded connection pole also can be replaced by holistic bolt, and the bolt passes connecting rod lid 2 and connecting rod body 1 in proper order and is connected it as a whole, and connecting rod body 1 is kept away from to the bolt head end, and still cooperates nut 8 at the bolt head end, and the inside department of bolt is equipped with heating channel 4, sets up screw hole 12 at the bolt head end simultaneously, this screw hole 12 and heating channel 4 intercommunication, other parts and this bolt homoenergetic cooperate the use equally.
Furthermore, the threaded connecting rod is a stud 3, one end of the stud 3 penetrates through the connecting rod cover 2 and is screwed into the connecting rod body 1, a nut 8 is arranged on the stud 3, a heating channel 4 is arranged in the stud 3, and the heating channel 4 is communicated with a threaded hole 12 formed in the end portion of the stud 3.
Further, above-mentioned locking passageway is for setting up in the connecting rod body 1 with the 1 internal thread hole vertically mounting hole of connecting rod body, above-mentioned mounting hole and internal thread hole intercommunication, be equipped with cylindric lock 6 in the mounting hole, this cylindric lock 6 inserts the cylindrical hole of setting at 3 roots of stud and locks stud 3 with the cooperation of cylindric lock 6, is close to the inside threaded hole that is equipped with of 1 outer wall one end of connecting rod body at cylindric lock 6, makes things convenient for the dismantlement of cylindric lock 6, is equipped with holding screw 5 on the connecting rod body 1 that is close to the mounting hole, and this holding screw 5 is fixed with cylindric lock 6.
Further, a locking key plate 7 is arranged between the connecting rod body 1 and the connecting rod cover 2, the locking key plate 7 comprises a circular ring plate and two convex keys 13 arranged along the axial direction of the circular ring plate and on the inner circular surface of the circular ring plate, and the two convex keys 13 are respectively matched with two key grooves arranged at the end part of the connecting rod cover 2 correspondingly. The key 13 can be fitted into a key groove formed in the end of the link cover 2, and can prevent relative rotation between the lock key plate 7 and the link cover 2.
Furthermore, twelve equal locking folding edges 14 are arranged on the periphery of the circular ring plate. The locking flange 14 can be bent to one side, and after the stud bolt 3 is heated to be pre-stretched and the nut 8 is tightened, the locking flange 14 is folded and flanged to the direction of the nut 8 to prevent the locking key plate 7, the connecting rod cover 2 and the nut 8 from loosening relatively.
Above-mentioned stretching device is including placing support 10 at the terminal surface of connecting rod lid 2, the outside of nut 8 on connecting rod lid 2 is placed to this support 10, and this support 10 is square casing or cuboid shell structure or cylinder casing, this support 10 sets up to the cuboid casing in this embodiment, be equipped with opening 9 with the 2 terminal surface vertically one side of connecting rod lid on the cuboid casing, can screw up nut 8 through this opening 9, be equipped with the through-hole with the terminal surface that connecting rod lid 2 is parallel on the cuboid casing, it has stretching bolt 11 to pass this through-hole setting on support 10, stretching bolt 11 cooperates with screw hole 12 in the stud 3. The bracket 10 can provide a support for a tension bolt 11, and the tension bolt 11 connects the bracket 10 and the stud 3 together, and the tension bolt 11 is screwed into a threaded hole 12 in the stud 3 to be stretched.
Example 2
This embodiment is an alternative to the locking channel and locking device of embodiment 1.
As shown in fig. 8-9, this embodiment is an alternative to the locking channel and locking means inside it of embodiment 1.
The locking channel comprises a step hole which is communicated with an internal thread hole in the connecting rod body 1 through a fan-shaped groove, the inner wall of the stepped hole is provided with threads close to the outer wall of the connecting rod body 1, the outer wall of the stepped hole is provided with an inner round hole far away from the outer wall of the connecting rod body 1, the stepped hole is communicated with the inner threaded hole of the connecting rod body 1 through a fan-shaped groove, one end surface of the sector groove is a sector surface, the other end surface of the sector groove is a plane, the end of the plane is close to the stepped hole, the end of the sector surface is far away from the stepped hole, a sector locking pressing block 16 which is the same as the groove in shape is arranged in the sector groove, because the fan-shaped locking pressing block 16 is arranged in the fan-shaped groove, one end of the fan-shaped locking pressing block 16 is a fan-shaped surface, one end of the fan-shaped surface is arranged in the fan-shaped groove at the end of the fan-shaped surface, the other end of the fan-shaped surface is a plane, one end of the plane is arranged in the fan-shaped groove at the end of the plane, and a threaded hole is formed in the plane end of the fan-shaped locking pressing block 16 and used for dismounting the fan-shaped locking. Be equipped with the internal thread with stud 3 matched with in the sector of fan-shaped locking briquetting 16, planar one end and the one end butt of locking bolt 15 set up in the sector of fan-shaped locking briquetting 16 and the thread tooth that stud 3 can be avoided damaging at the in-process of locking with stud 3 complex internal thread, improve reliability, the stability of fastening. The fan-shaped locking pressing block 16 is pushed by screwing the locking bolt 15, the stud bolt 3 can be pressed tightly by the fan-shaped locking pressing block 16, and the fastening effect of the stud bolt 3 is further improved.
Further, be equipped with the through-hole at locking bolt 15's bolt head end, can connect a plurality of locking bolt 15 with the iron wire through this through-hole for prevent that locking bolt 15 is not hard up, improve the locking effect.
The installation and fastening process of the invention is as follows:
corresponding to the working process of the embodiment 1, aligning the unthreaded hole of the connecting rod cover 2 and the internal thread hole of the connecting rod body 1, and installing the stud 3; then inserting the convex key 13 of the locking key plate 7 into the key slot at the end part of the connecting rod cover 2, and then sleeving the nut 8 on the stud bolt 3; mounting the tension bolt 11 on the bracket 10; inserting a heating rod into the heating channel 4 in the stud bolt 3 for heating, continuously screwing the nut 8 by using a metal expansion and contraction principle and a torque wrench according to the heating time and the elongation coefficient of the stud bolt 3, stopping stretching when the stretched preset deformation of the stud bolt 3 reaches a torque corner converted from the stretching coefficient of the stud bolt 3 to the corresponding nut 8, and taking out the heating rod; then, immediately screwing a stretching bolt 11 into a threaded hole 12 at the end part of the stud bolt 3, stretching the stud bolt 3 through the stretching bolt 11, rotating a nut 8 arranged on the stud bolt 3 while stretching, further screwing, folding and flanging a locking flanging 14 towards the direction of the nut 8, locking the locking key plate 7 and the nut 8 into a whole, finally, penetrating a cylindrical pin 6 into a mounting hole and further inserting the cylindrical hole at the root part of the stud bolt 3, and then fastening the cylindrical pin 6 by using a set screw 5.
Corresponding to the working process of the embodiment 2, firstly, the fan-shaped locking pressing block 16 penetrates through the internal threaded hole of the connecting rod body 1, and the fan-shaped locking pressing block 16 is installed in the fan-shaped groove; secondly, aligning the unthreaded hole of the connecting rod cover 2 and the internal thread hole of the connecting rod body 1, and installing a stud 3; then inserting the convex key 13 of the locking key plate 7 into the key slot at the end part of the connecting rod cover 2, and then sleeving the nut 8 on the stud bolt 3; mounting the tension bolt 11 on the bracket 10; inserting a heating rod into the heating channel 4 in the stud bolt 3 for heating, continuously screwing the nut 8 by using a metal expansion and contraction principle and a torque wrench according to the heating time and the elongation coefficient of the stud bolt 3, stopping stretching when the stretched preset deformation of the stud bolt 3 reaches a torque corner reached by the corresponding nut 8 according to the preset elongation coefficient of the stud bolt 3, and taking out the heating rod; then, the stretching bolt 11 is immediately screwed into the threaded hole 12 at the end of the stud bolt 3, the stud bolt 3 is stretched by the stretching bolt 11, the nut 8 arranged on the stud bolt 3 is rotated and further tightened while stretching, and then the locking flange 14 is folded and flanged towards the nut 8, so that the locking key plate 7 and the nut 8 are locked into a whole. And finally, screwing the locking bolts 15 into the stepped holes, wherein in the screwing process, one ends of the locking bolts 15, which are far away from the bolt heads, continuously press the fan-shaped locking pressing blocks 16 until internal threads in the fan-shaped ends of the fan-shaped locking pressing blocks 16 are matched with the threads on the stud bolts 3, stopping screwing the locking bolts 15, and then connecting the locking bolts 15 by using iron wires to finish the fastening process.
The above-described embodiments should not be construed as limiting the scope of the invention, and any alternative modifications or alterations to the embodiments of the present invention will be apparent to those skilled in the art.
The present invention is not described in detail, but is known to those skilled in the art.
Claims (4)
1. A fastening device for a crankshaft connecting rod of a mechanical press is used for connecting a connecting rod cover and a connecting rod body, a unthreaded hole is arranged in the connecting rod cover, an internal threaded hole is arranged in the connecting rod body, it is characterized by comprising a plurality of threaded connecting rods which are arranged at intervals and connected between a connecting rod body and a connecting rod cover, and nuts respectively arranged on the rod body of the threaded connecting rod in a penetrating way, a heating channel is arranged in the threaded connecting rod, a heating rod can be inserted into the heating channel to heat the threaded connecting rod, the heating channel is a straight hole which extends along the axial direction of the threaded connecting rod, the straight hole and the internal threaded hole of the connecting rod body form a closed heating cavity, a locking channel is arranged in the connecting rod body and is vertical to the internal thread hole, a locking device matched with the threaded connecting rod is arranged in the locking channel, a stretching device is arranged at a position corresponding to one end of the connecting rod cover, and a threaded hole matched with the stretching device is also formed in the opening end of the heating channel; a locking key plate is arranged between the connecting rod cover and the connecting rod body, the locking key plate comprises a circular ring plate, a plurality of equally-divided locking folded edges are arranged on the periphery of the circular ring plate, a plurality of convex keys are connected on the inner circular surface of the circular ring plate and arranged along the axial direction of the circular ring plate, and the convex keys are respectively matched with a plurality of key grooves arranged at the end part of the connecting rod cover correspondingly;
the stretching device comprises a support, the support is arranged on the end face of the connecting rod cap, the support is arranged on the outer side of the nut, an opening is formed in one surface, perpendicular to the end face of the connecting rod cap, of the support, a through hole is formed in the surface, parallel to the end face of the connecting rod cap, of the support, a stretching bolt penetrates through the through hole and is arranged on the support, and the stretching bolt penetrates through the through hole formed in the support and is connected with the threaded connecting rod;
the locking channel comprises a stepped hole, and the stepped hole is communicated with an internal threaded hole in the connecting rod body through a fan-shaped groove; locking device includes locking bolt and with the fan-shaped locking briquetting of locking bolt butt, locking bolt sets up in the shoulder hole, fan-shaped locking briquetting setting with fan-shaped locking briquetting shape the same fan-shaped inslot, fan-shaped locking briquetting one end and locking bolt butt, the other end and threaded connection spare screw-thread fit.
2. The mechanical press crankshaft connecting rod fastening device of claim 1, wherein: one end face of the fan-shaped locking pressing block is an arc-shaped face, the other end face of the fan-shaped locking pressing block is a plane, the plane end of the fan-shaped locking pressing block is abutted to the locking bolt, the arc-shaped face end of the fan-shaped locking pressing block is in threaded connection with the threaded connecting rod, and the linear width of the arc-shaped face is smaller than the diameter of the threaded connecting rod and larger than the.
3. The mechanical press crankshaft connecting rod fastening device of claim 1, wherein: and the bolt head end of the locking bolt is provided with a through hole.
4. The mechanical press crankshaft connecting rod fastening device of claim 1, wherein: the threaded connecting rod is a stud.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910090186.7A CN109676989B (en) | 2019-01-30 | 2019-01-30 | Fastening device for crankshaft connecting rod of mechanical press |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910090186.7A CN109676989B (en) | 2019-01-30 | 2019-01-30 | Fastening device for crankshaft connecting rod of mechanical press |
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| Publication Number | Publication Date |
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| CN109676989A CN109676989A (en) | 2019-04-26 |
| CN109676989B true CN109676989B (en) | 2020-01-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910090186.7A Active CN109676989B (en) | 2019-01-30 | 2019-01-30 | Fastening device for crankshaft connecting rod of mechanical press |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110107582B (en) * | 2019-04-30 | 2021-03-23 | 广东锻压机床厂有限公司 | Connecting rod nut and stud anti-loosening assembly of press machine |
| CN114483760A (en) * | 2021-12-31 | 2022-05-13 | 宁波中策动力机电集团有限公司 | Connecting rod structure of high-power engine |
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| CN109676989A (en) | 2019-04-26 |
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Effective date of registration: 20230529 Address after: No.59 Xingye Road, Rongcheng City, Weihai City, Shandong Province, 264300 Patentee after: RONGCHENG HUADONG METAL-FORMING MACHINERY CO.,LTD. Address before: No.59 Xingye Road, Rongcheng City, Weihai City, Shandong Province, 264300 Patentee before: RONGCHENG HUADONG METAL-FORMING MACHINERY CO.,LTD. Patentee before: Li Lifeng |
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